BATAVIA - A woman accused of killing her 6-year-old son in February was criminally insane the day the boy died, prosecutors said Tuesday.

That determination, which they said was made by a court psychiatrist, comes on the heels of a diagnosis by the psychiatrist treating Christina Miracle, who reportedly said Miracle suffers from a mental illness that made her delusional the day her son died.

The diagnosis will help Miracle's lawyer argue her not-guilty-by-reason-of-insanity plea when her trial starts Jan. 7.

Miracle, 26, of Miami Township, was indicted on charges of murder and involuntary manslaughter in the Feb. 6 death of Brandon Lehn. Authorities have said the boy died of homicidal violence.

Assistant Clermont County prosecutor Daniel "Woody" Breyer and Miracle's attorney, R. Scott Croswell, discussed the psychiatrist's report, which is not a public record and was not released.

Since her arrest, Miracle has been treated at Summit Behavioral Center in Cincinnati.

Miracle takes antipsychotic medicine to stabilize her moods, her doctor, Dr. Adelaida Fernandez, said during a previous court hearing.

Miracle has been diagnosed as bipolar, a mood disorder marked by periods of an elevated mood characterized by racing thoughts, poor judgment and great energy. It can also bring on psychotic delusions and exaggerated religious thoughts, Fernandez said.

The morning of Feb. 5, Brandon didn't go to school. When David Lehn, the boy's father, called to find out why, Brandon said his mother was "talking freaky."

The next day, Brandon was dead.

"He died from some sort of asphyxiation," Breyer previously said. "Either suffocation through strangulation or drowning."